All nodes in the cluster are required to run the same version of the operating system.
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a – If you are installing Oracle Solaris 11.3 SRUs after SRU 1, you should upgrade to Oracle Solaris Cluster 4.3. SRUs released after Oracle Solaris 11.3 SRU 1 could impact Oracle Solaris Cluster and its data services. Later Oracle Solaris 11.3 SRUs were not tested with Oracle Solaris Cluster 4.2.
The minimal supported OS package set is the "solaris-small-server" package group. Starting with Oracle Solaris Cluster 4.3 SRU 4, the "solaris-minimal-server" package group introduced in Oracle Solaris 11.2 may also be used. See Oracle Solaris Cluster and Oracle Solaris OS Minimization Support Required Packages Group (Doc ID 1544605.1) on My Oracle Support for more info.